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Finding the Fourth Proportional to 25,620.40, 38,430.60 and 13,810.60

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Solution

The fourth proportional to 25,620.40, 38,430.60 and 13,810.60 is: 20,715.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    25,620.40 : 38,430.60 = 13,810.60 : x
  2. Step 2: Convert to fraction form
    25,620.40/38,430.60 = 13,810.60/x
  3. Step 3: Cross multiply
    25,620.40x = 38,430.60 × 13,810.60
  4. Step 4: Simplify right side
    25,620.40x = 530,749,644.36
  5. Step 5: Solve for x
    x = 530,749,644.36/25,620.40
  6. Step 6: Final answer
    x = 20,715.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.